Heating equipment temperature change monitoring system

Abstract

The invention, which relates to the technical field of heating equipment temperature control, discloses a heating equipment temperature change monitoring system comprising a heating module, an infrared temperature measurement module, a sorting module and a control module. The infrared temperature measurement module is used for acquiring the inlet temperature of an object before the object enters the heating equipment and the outlet temperature after the object is heated; the control module controls the heating module to heat the object based on the inlet temperature of the object before the object enters the heating equipment, and generates a control signal of the sorting module based on the outlet temperature of the heated object; the sorting module is used for sorting objects based on the control signal generated by the control module; the heating module is used for heating an object; the temperature of an object in the heating furnace is prevented from being measured, and the temperature of the heated object is effectively controlled on the basis of open-loop heating; and the heating time of the object is controlled, so that the object continuously and stably enters the next processing link, and the efficiency of the processing flow is improved.

Description

Technical Field

[0001] The invention relates to the technical field of temperature control of heating equipment, in particular to a temperature change monitoring system of heating equipment. Background Art

[0002] With the continuous development of science and technology, the technical level of heating equipment is constantly improving, including intelligent control, high-efficiency energy-saving technology, etc. At the same time, enterprises are also constantly updating equipment and introducing advanced heating equipment to improve production efficiency and product quality. The automation and intelligence of modern heating equipment are getting higher and higher. Many companies have introduced automatic control systems and intelligent sensors to achieve real-time monitoring and control of heating equipment, improving production efficiency and the accuracy of temperature control. When monitoring the temperature of heating equipment, measuring the temperature of the object in the heating equipment is a key link. However, due to factors such as high temperature environment, complex structure in the furnace, and limitations of measuring equipment, temperature measurement often faces certain challenges. Many companies still use traditional temperature measurement methods, which are neither accurate nor efficient, resulting in the outlet temperature of the object failing to meet the requirements of the next processing link. Summary of the invention

[0003] The object of the present invention is to provide a system for monitoring temperature changes of heating equipment to solve the problems raised in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a heating equipment temperature change monitoring system, comprising a heating module, an infrared temperature measurement module, a sorting module and a control module; the output end of the infrared temperature measurement module is connected to the input end of the control module, so as to obtain the inlet temperature of the object before entering the heating equipment and the outlet temperature after heating; the control module controls the heating module to heat the object based on the inlet temperature of the object before entering the heating equipment, and generates a control signal for the sorting module based on the outlet temperature of the object after heating; the sorting module sorts the objects based on the control signal generated by the control module, and returns the object if the temperature does not meet the requirements; the heating module is used to heat the object and reheat the returned object.

[0005] Specifically, the system also includes a conveying module, and the control module generates a control signal for the sorting module based on the outlet temperature of the object after heating. If the outlet temperature of the object after heating meets the temperature requirement, the sorting module opens the first channel, and the conveying module allows the object to enter a subsequent processing link; if the outlet temperature of the object after heating does not meet the temperature requirement, the sorting module opens the second channel, and the conveying module returns the object to the heating module for reheating.

[0006] Specifically, the system also includes a cooling module. When the outlet temperature of the object after heating does not meet the temperature requirement, the object is transported to the cooling module via the conveying module for cooling. After cooling is completed, the conveying module transports the object to the heating module.

[0007] Specifically, the control module also includes a differential unit, a heat analysis unit, a first set value determination unit and a second set value determination unit; the differential unit is used to establish a differential equation for the temperature of an object in the heating device changing with time; the heat analysis unit is used to analyze the relationship between the absorbed heat Q and the temperature T; the first set value determination unit generates a first set value for the object based on the inlet temperature of the object before entering the heating device; the second set value determination unit determines the second set value for the object based on the error between the set value and the actual value after the heating of the object is completed.

[0008] The differential unit first establishes a differential equation for the temperature of an object in the heating device changing with time through the following steps: Set up the differential equation: , where T represents the object temperature, T jr represents the temperature of the heating device, t represents the heating time, and k represents a constant; Then solve the differential equation, separate the variables according to the differential equation and integrate them to get the following expression: , and finally after simplification we get: , where T 0 Indicates the inlet temperature of an object before it enters the heating device.

[0009] After obtaining the relationship between the inlet temperature, the temperature of the heating device and the heating time, the heating time of the object can be known according to the heating temperature that the object needs to reach, and the object can be heated according to the determined heating time.

[0010] The heat analysis unit analyzes the relationship between the absorbed heat Q and the temperature T through the following steps: According to the heat formula and heating power, an equation is established: c×m×ΔT=P×t×η, where c is the specific heat capacity of the object, m is the mass of the object, ΔT is the temperature change of the object, P is the power of the heating device, and η is the efficiency of the heating device; the constants in the equation are integrated to obtain a new equation: A×ΔT=B×t, where A and B are constants; the historical data of the object being heated by the heating device is obtained, and two sets of data are taken from the data with the same heating device power to establish the equation group: , where ΔT 1 and ΔT 2 is the temperature change of the object, t 1 and t 2is the heating time of the object. After solving, we get the constant A. After solving multiple times, we take the average value to reduce the influence of randomness. According to the constant A, we get the relationship between the absorbed heat Q and the temperature T: Q=A×ΔT.

[0011] The first set value determination unit generates a first set value of the object based on the inlet temperature of the object before entering the heating device, and further comprises the following steps: Get the expected value ET of the inlet temperature of the object before entering the heating device in , the upper limit of temperature T is required u and lower limit T d , based on the expected value of the inlet temperature ET in and lower limit T d Determine the lower limit Q of the absorbed heat d , based on the expected value of the inlet temperature ET in and upper limit T u Determine the upper limit Q of the absorbed heat u , according to Q d and Q u Get the median Q of the absorbed heat mid , according to the expected value of the inlet temperature ET of the object before entering the heating device in and the median Q of the absorbed heat mid Get the expected value ET of the outlet temperature after the object is heated out , based on ET out The expected value E of the heating time of the object is determined by the differential equation of the temperature change of the object in the heating device over time t ; Get the inlet temperature T of the object before it enters the heating device in , according to T in , the expected value of the object heating time E t The differential equation of the temperature change of the object in the heating device over time determines the outlet temperature T of the object after heating is completed out , if the outlet temperature T out In the required range [T d ,T u ], where T d and T u represents the lower and upper temperature limits, then the inlet temperature T of the object before entering the heating device in The corresponding first setting value is T out , if the outlet temperature T out Higher than T u , then the corresponding first setting value is T u ; If the outlet temperature T out Less than T d , then the corresponding first setting value is T d .

[0012] In order to meet the efficiency requirements of industrial processing, the outlet temperature of the object is controlled by controlling the heating time of the object in the heating process. At the same time, in order to enable the subsequent processing links to continuously and stably obtain the heated object, the heating time of the heated object is controlled so that the object is heated as much as possible according to the expected value E of the heating time. t Heating can also reduce the burden of subsequent processing links.

[0013] Since an open-loop control system is used, there may be an error between the actual temperature and the required temperature. Therefore, the outlet temperature of the object is detected, and the second set value is fine-tuned according to the detection result; The second set value determination unit determines the second set value of the object based on the error between the set value and the actual value after the object is heated, and further includes the following steps: After the object is heated, the heat error e between the set value and the actual value is obtained, and then according to the inlet temperature T of the object before entering the heating device in , respectively determine the object from T in The heat absorbed by the object from T in The temperature rises to the heat Q2 absorbed by TR, e=Q1-Q2, where RT1 represents the first set value and TR represents the actual value; If the heat error e between the first set value and the actual value is greater than or equal to zero, the actual value of the object temperature is equal to the lower limit of the temperature T d If the distance between them decreases, the first set value RT is compensated, and the first set value is increased to obtain the compensated second set value RT2, RT2=RT1+ΔRT, where ΔRT is the compensation value; If the heat error e between the first set value and the actual value is less than zero, the actual value of the object temperature is equal to the upper temperature limit T u When the distance between them decreases, the first set value RT1 is compensated, and the first set value is reduced to obtain the compensated second set value RT2, RT2=RT+ΔRT1; The compensation value is determined by the following formula: ΔRT=Kp×e(n)+Ki×t(n)×e(n)+Kd×[e(n)-e(n-1)] / t(n), where e(n) is the heat error between the current set value and the actual value, e(n-1) is the heat error between the previous set value and the actual value, t(n) is the heating time of the current object, and Kp, Ki and Kd are control parameters.

[0014] Specifically, the control module also includes a main controller, which obtains the inlet temperature of the object before entering the heating device from the infrared temperature measurement module, and determines a first set value of the object according to the inlet temperature of the object before entering the heating device; determines a second set value according to the historical heating data of the object in the heating device and the first set value, controls the heating time of the object by the heating device based on the second set value, determines the thermal error between the object temperature and the first set value after the heating of the object is completed, and updates the compensation value to determine the second set value of the next object.

[0015] Specifically, the system further includes a data storage module, and the data storage module is used to store historical heating data of the object in the heating device.

[0016] Compared with the prior art, the beneficial effects of the present invention are: avoiding measuring the temperature of objects in the heating furnace, reducing resource consumption; in response to the situation where the starting temperatures of the heated objects are different, effective control of the temperature of the heated objects is achieved by reheating the objects on the basis of open-loop heating; the heating time of the objects is controlled so that the objects can continuously and stably enter the next processing link, thereby improving the efficiency of the processing flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a temperature change monitoring system for a heating device according to the present invention; Figure 2 The present invention is a control flow chart of a heating equipment temperature change monitoring system. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1: Figure 1As shown, the present invention provides a technical solution, a heating equipment temperature change monitoring system, comprising a heating module, an infrared temperature measurement module, a sorting module and a control module; the output end of the infrared temperature measurement module is connected to the input end of the control module, for obtaining the inlet temperature of the object before entering the heating equipment and the outlet temperature after heating; the control module controls the heating module to heat the object based on the inlet temperature of the object before entering the heating equipment, and generates a control signal for the sorting module based on the outlet temperature of the object after heating; the sorting module sorts the objects based on the control signal generated by the control module, and returns the object whose temperature does not meet the requirements; the heating module is used to heat the object and reheat the returned object.

[0020] The sorting module includes an electric baffle and a rotating robotic arm, which determines whether the object enters the finished product conveyor belt or the reheating conveyor belt based on the control signal.

[0021] The infrared temperature measurement module is deployed at the front and rear positions of the heating area to quickly and accurately measure the starting temperature of the object, and transmit the temperature data to the control module and the data storage module in real time; the control module receives the inlet temperature data measured by the infrared temperature measurement module, generates the heating time of the object according to different inlet temperatures, and heats the object; and receives the outlet temperature data measured by the infrared temperature measurement module to determine whether the object will directly enter the finished product area or need to be reheated. If reheating is required, the sorting module is controlled to change the direction of the object and guide the object to the reheating conveyor belt, and then switch to the direction of the finished product conveyor belt after the guidance is completed; if reheating is not required, it remains in the direction of the finished product conveyor belt.

[0022] The temperature data collected by the infrared temperature measurement module needs to be transmitted to the control module in a timely manner. The wired transmission method has the advantages of strong anti-interference ability and long transmission distance. It is suitable for the complex electromagnetic environment of the industrial site. RS485 bus can be used for data transmission.

[0023] It also includes a conveying module, wherein the control module generates a control signal for the sorting module based on the outlet temperature of the object after heating. If the outlet temperature of the object after heating meets the temperature requirement, the sorting module opens the first channel, and the conveying module allows the object to enter the subsequent processing link; if the outlet temperature of the object after heating does not meet the temperature requirement, the sorting module opens the second channel, and the conveying module allows the object to return to the heating module for reheating. The conveying module includes a finished product conveyor belt, a reheating conveyor belt, and a loading conveyor belt; wherein the loading conveyor belt is used to convey the object from the previous link to the front of the heating module.

[0024] It also includes a cooling module. When the outlet temperature of the object after heating does not meet the temperature requirement, the object is transported to the cooling module via the transport module for cooling. After cooling is completed, the transport module transports the object to the heating module.

[0025] The control module also includes a differential unit, a heat analysis unit, a first set value determination unit and a second set value determination unit; the differential unit is used to establish a differential equation for the temperature of an object in the heating device changing with time; the heat analysis unit is used to analyze the relationship between the absorbed heat Q and the temperature T; the first set value determination unit generates a first set value for the object based on the inlet temperature of the object before entering the heating device; the second set value determination unit determines the second set value for the object based on the error between the set value and the actual value after the object is heated.

[0026] The differential unit establishes a differential equation for the temperature of an object in the heating device changing with time by the following steps: Set up the differential equation: , where T represents the object temperature, T jr represents the temperature of the heating device, t represents the heating time, and k represents a constant; Solving the differential equation, separating the variables according to the differential equation and integrating them, we get the following expression: , after simplification, we get: , where T 0 Indicates the inlet temperature of an object before it enters the heating device.

[0027] The heat analysis unit analyzes the relationship between the absorbed heat Q and the temperature T through the following steps: According to the heat formula and heating power, an equation is established: c×m×ΔT=P×t×η, where c is the specific heat capacity of the object, m is the mass of the object, ΔT is the temperature change of the object, P is the power of the heating device, and η is the efficiency of the heating device; the constants in the equation are integrated to obtain a new equation: A×ΔT=B×t, where A and B are constants; the historical data of the object being heated by the heating device is obtained, and two sets of data are taken from the data with the same heating device power to establish the equation group: , where ΔT 1 and ΔT 2 is the temperature change of the object, t 1 and t 2 is the heating time of the object. After solving, we get the constant A. After solving multiple times, we take the average value to reduce the influence of randomness. According to the constant A, we get the relationship between the absorbed heat Q and the temperature T: Q=A×ΔT.

[0028] The first set value determination unit generates a first set value of the object based on the inlet temperature of the object before entering the heating device, and further comprises the following steps: Get the expected value ET of the inlet temperature of the object before entering the heating device in , the upper limit of temperature T is required u and lower limit Td , based on the expected value of the inlet temperature ET in and lower limit T d Determine the lower limit Q of the absorbed heat d , based on the expected value of the inlet temperature ET in and upper limit T u Determine the upper limit Q of the absorbed heat u , according to Q d and Q u Get the median Q of the absorbed heat mid , according to the expected value of the inlet temperature ET of the object before entering the heating device in and the median Q of the absorbed heat mid Get the expected value ET of the outlet temperature after the object is heated out , based on ET out The expected value E of the heating time of the object is determined by the differential equation of the temperature change of the object in the heating device over time t ; Get the inlet temperature T of the object before it enters the heating device in , according to T in , the expected value of the object heating time E t The differential equation of the temperature change of the object in the heating device over time determines the outlet temperature T of the object after heating is completed out , if the outlet temperature T out In the required range [T d ,T u ], where T d and T u represents the lower and upper temperature limits, then the inlet temperature T of the object before entering the heating device in The corresponding first setting value is T out , if the outlet temperature T out Higher than T u , then the corresponding first setting value is T u ; If the outlet temperature T out Less than T d , then the corresponding first setting value is T d .

[0029] The second set value determination unit determines the second set value of the object based on the error between the set value and the actual value after the object is heated, and further includes the following steps: After the object is heated, the heat error e between the set value and the actual value is obtained, and then according to the inlet temperature T of the object before entering the heating device in , respectively determine the object from T in The heat absorbed by the object from T inThe temperature rises to the heat Q2 absorbed by TR, e=Q1-Q2, where RT1 represents the first set value and TR represents the actual value; If the heat error e between the first set value and the actual value is greater than or equal to zero, the actual value of the object temperature is equal to the lower limit of the temperature T d If the distance between them decreases, the first set value RT is compensated, and the first set value is increased to obtain the compensated second set value RT2, RT2=RT1+ΔRT, where ΔRT is the compensation value; If the heat error e between the first set value and the actual value is less than zero, the actual value of the object temperature is equal to the upper temperature limit T u When the distance between them decreases, the first set value RT1 is compensated, and the first set value is reduced to obtain the compensated second set value RT2, RT2=RT+ΔRT1; The compensation value is determined by the following formula: ΔRT=Kp×e(n)+Ki×t(n)×e(n)+Kd×[e(n)-e(n-1)] / t(n), where e(n) is the heat error between the current set value and the actual value, e(n-1) is the heat error between the previous set value and the actual value, t(n) is the heating time of the current object, and Kp, Ki and Kd are control parameters.

[0030] The control module also includes a main controller, which obtains the inlet temperature of the object before entering the heating device from the infrared temperature measurement module, determines a first set value of the object according to the inlet temperature of the object before entering the heating device; determines a second set value according to the historical heating data of the object in the heating device and the first set value, controls the heating time of the object by the heating device based on the second set value, determines the thermal error between the object temperature and the first set value after the heating of the object is completed, and updates the compensation value to determine the second set value of the next object.

[0031] It also includes a data storage module, which is used to store historical heating data of the object in the heating device.

[0032] Embodiment 2: Figure 2As shown, a control flow chart of a temperature change monitoring system for a heating device is provided. First, the user inputs the required outlet temperature of the object. When the object to be heated arrives at the heating module via a conveyor belt, the infrared temperature measurement module collects the temperature signal and transmits it to the main controller. The main controller performs open-loop control on the temperature of the object, generates a first set value and a second set value according to the inlet temperature of the object, determines the parameters of the heating module according to the second set value, and heats the object. In this process, the first set value remains unchanged and is only related to the inlet temperature of the object. On the basis of the first set value, a compensation value is added, and the compensation value is fine-tuned in real time as the object is heated, so that the second set value is fine-tuned in real time as the object is heated. Since it is an open-loop control, there will be an error in the outlet temperature of the object. If the heat error e between the first set value and the actual value is less than zero, it means that the object absorbs more heat. When the initial temperature of the object is high, it may exceed the upper limit of the temperature. For this reason, on the basis of the first set value, it is appropriately reduced, and the heating module parameters are determined according to the reduced second set value. In this way, even if there is still an error, the distance between the outlet temperature of the object and the upper limit of the temperature can be increased; on the contrary, the heat error e between the first set value and the actual value is greater than or equal to zero. For objects with the same inlet temperature, the first set value is the same, and the second set value can be different. The reason is that the thermal error e between the first set value and the actual value is constantly changing, and the compensation value ΔRT is determined by error feedback control; if the thermal error e(n) between the first set value and the actual value is less than zero, Kp will first have a direct impact and reduce the set value. The impact of Kp is only for the thermal error e between the first set value and the actual value this time (nth time), and has no impact on the subsequent ones; Kd plays a predictive role, and adjustments are made in advance by testing the changing trend of the thermal error e(n); Kd accumulates over time and is used to reduce the steady-state error.

[0033] When the inlet temperatures of the nth and n-1th objects are the same, the error generated for the n-1th compensation value is e(n-1), and ΔRT is obtained based on e(n-1). When the nth object arrives at the inlet of the heating module, since the inlet temperatures are the same, the first set value is the same, but ΔRT changes after e(n-1) is generated. The nth object is heated according to the second set value after the ΔRT changes. In order to save resources and improve processing efficiency, the heating time of the object in the heating module is controlled to achieve temperature control of the object, the heating time is determined according to the second set value, and compared with the first set value to obtain the error.

[0034] The main controller can use a microprocessor or a programmable logic controller. The microprocessor is highly flexible and can easily implement complex data processing algorithms. The programmable logic controller is widely used in the industrial field, has extremely high reliability, has powerful logic control capabilities, and can process a large number of input and output signals at the same time. The sub-controller only needs to perform simple logical judgments and can use a microprocessor.

[0035] After the heating is completed, the infrared temperature measurement module measures the temperature of the object again and sends the temperature signal to the main controller and the sub-controller. The sub-controller controls the conveyor belt that the object is to enter.

[0036] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A heating equipment temperature change monitoring system, characterized in that: It includes a heating module, an infrared temperature measuring module, a sorting module and a control module; the output end of the infrared temperature measuring module is connected to the input end of the control module, so as to obtain the inlet temperature of the object before entering the heating device and the outlet temperature after heating; the control module controls the heating module to heat the object based on the inlet temperature of the object before entering the heating device, and generates a control signal for the sorting module based on the outlet temperature of the object after heating; the sorting module sorts the objects based on the control signal generated by the control module, and solves the problem that the returned temperature does not meet the requirements; the heating module is used to heat the objects and reheat the returned objects.

2. A heating equipment temperature change monitoring system according to claim 1, characterized in that: It also includes a conveying module, and the control module generates a control signal for the sorting module based on the outlet temperature of the object after heating. If the outlet temperature of the object after heating meets the temperature requirement, the sorting module opens the first channel, and the conveying module allows the object to enter a subsequent processing link; if the outlet temperature of the object after heating does not meet the temperature requirement, the sorting module opens the second channel, and the conveying module returns the object to the heating module for reheating.

3. A heating equipment temperature change monitoring system according to claim 2, characterized in that: It also includes a cooling module. When the outlet temperature of the object after heating does not meet the temperature requirement, the object is transported to the cooling module via the transport module for cooling. After cooling is completed, the transport module transports the object to the heating module.

4. A heating equipment temperature change monitoring system according to claim 3, characterized in that: The control module also includes a differential unit, a heat analysis unit, a first set value determination unit and a second set value determination unit; the differential unit is used to establish a differential equation for the temperature of an object in the heating device changing with time; the heat analysis unit is used to analyze the relationship between the absorbed heat Q and the temperature T; the first set value determination unit generates a first set value for the object based on the inlet temperature of the object before entering the heating device; the second set value determination unit determines the second set value for the object based on the error between the set value and the actual value after the object is heated.

5. A heating equipment temperature change monitoring system according to claim 4, characterized in that: The differential unit establishes a differential equation for the temperature of an object in the heating device changing with time by the following steps: Set up the differential equation: , where T represents the object temperature, T jr represents the temperature of the heating device, t represents the heating time, and k represents a constant; Solving the differential equation, separating the variables according to the differential equation and integrating them, we get the following expression: , after simplification we get: , where T0 represents the inlet temperature of the object before entering the heating equipment.

6. A heating equipment temperature change monitoring system according to claim 5, characterized in that: The heat analysis unit analyzes the relationship between the absorbed heat Q and the temperature T through the following steps: According to the heat formula and heating power, an equation is established: c×m×ΔT=P×t×η, where c is the specific heat capacity of the object, m is the mass of the object, ΔT is the temperature change of the object, P is the power of the heating device, and η is the efficiency of the heating device; the constants in the equation are integrated to obtain a new equation: A×ΔT=B×t, where A and B are constants; the historical data of the object being heated by the heating device is obtained, and two sets of data are taken from the data with the same heating device power to establish the equation group: , where ΔT1 and ΔT2 are the temperature changes of the object, t1 and t2 are the heating time of the object. After solving, we get the constant A. After solving multiple times, we take the average value to reduce the influence of randomness. According to the constant A, we get the relationship between the absorbed heat Q and the temperature T: Q=A×ΔT.

7. A heating equipment temperature change monitoring system according to claim 6, characterized in that: The first set value determination unit generates a first set value of the object based on the inlet temperature of the object before entering the heating device, and further comprises the following steps: Get the expected value ET of the inlet temperature of the object before entering the heating device in , the upper limit of temperature T is required u and lower limit T d , based on the expected value of the inlet temperature ET in and lower limit T d Determine the lower limit Q of the absorbed heat d , based on the expected value of the inlet temperature ET in and upper limit T u Determine the upper limit Q of the absorbed heat u , according to Q d and Q u Get the median Q of the absorbed heat mid , based on the expected value of the inlet temperature ET of the object before entering the heating device in and the median Q of the absorbed heat mid Get the expected value ET of the outlet temperature after the object is heated out , based on ET out The expected value E of the heating time of the object is determined by the differential equation of the temperature change of the object in the heating device over time t ; Get the inlet temperature T of the object before it enters the heating device in , according to T in , the expected value of the object heating time E t The differential equation of the temperature change of the object in the heating device over time determines the outlet temperature T of the object after heating is completed out , if the outlet temperature T out In the required range [T d ,T u ], where T d and T u represents the lower and upper temperature limits, then the inlet temperature T of the object before entering the heating device in The corresponding first setting value is T out , if the outlet temperature T out Higher than T u , then the corresponding first setting value is T u ; If the outlet temperature T out Less than T d , then the corresponding first setting value is T d .

8. A heating equipment temperature change monitoring system according to claim 7, characterized in that: The second set value determination unit determines the second set value of the object based on the error between the set value and the actual value after the object is heated, and further comprises the following steps: After the object is heated, the heat error e between the set value and the actual value is obtained, and then according to the inlet temperature T of the object before entering the heating device in , respectively determine the object from T in The heat absorbed by the object from T in The temperature rises to the heat Q2 absorbed by TR, e=Q1-Q2, where RT1 represents the first set value and TR represents the actual value; If the heat error e between the first set value and the actual value is greater than or equal to zero, the actual value of the object temperature is equal to the lower limit of the temperature T d If the distance between them decreases, the first set value RT is compensated, and the first set value is increased to obtain the compensated second set value RT2, RT2=RT1+ΔRT, where ΔRT is the compensation value; If the heat error e between the first set value and the actual value is less than zero, the actual value of the object temperature is equal to the upper temperature limit T u When the distance between them decreases, the first set value RT1 is compensated, and the first set value is reduced to obtain the compensated second set value RT2, RT2=RT+ΔRT1; The compensation value is determined by the following formula: ΔRT=Kp×e(n)+Ki×t(n)×e(n)+Kd×[e(n)-e(n-1)] / t(n), where e(n) is the heat error between the current set value and the actual value, e(n-1) is the heat error between the previous set value and the actual value, t(n) is the heating time of the current object, and Kp, Ki and Kd are control parameters.

9. A heating equipment temperature change monitoring system according to claim 8, characterized in that: The control module also includes a main controller, which obtains the inlet temperature of the object before entering the heating device from the infrared temperature measurement module, determines a first set value of the object according to the inlet temperature of the object before entering the heating device; determines a second set value according to the historical heating data of the object in the heating device and the first set value, controls the heating time of the object by the heating device based on the second set value, determines the thermal error between the object temperature and the first set value after the heating of the object is completed, and updates the compensation value to determine the second set value of the next object.

10. A heating equipment temperature change monitoring system according to claim 9, characterized in that: It also includes a data storage module, which is used to store historical heating data of the object in the heating device.

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